Yahaya, who came from Potiskum, in Yobe state, north-east Nigeria, was captured by a vigilante group called Civilian JTF in 2015 – a year after the girls were snatched from Government Girls Secondary School in Borno state.

Of the 276 girls taken in April 2014, 112 are still in captivity.

This week, some 700 of the suspected militants are due to appear before the judges in Kanji, according to sources at the court.

On Monday, 20 were found guilty of crimes associated with Boko Haram, while two were discharged for lack of evidence.